JP2024027270A - Image display device, optical unit, and method for manufacturing the optical unit - Google Patents

Abstract

An object of the present invention is to suppress the occurrence of deterioration in video quality. SOLUTION: An HMD 200 includes a first display element 11a, a holder 31 that holds the first display element 11a, a first projection optical system 12a that projects an image formed on the first display element 11a, and a first projection optical system 12a that projects an image formed on the first display element 11a. A case CA that houses the optical system 12a in a positioned state and has an insertion opening 41z into which the first display element 11a supported by the holder 31 is inserted, and a first metal frame 52a that supports the case CA. The first metal frame 52a has a receiving opening OR that is larger than the outline of the holder 31 when viewed from the insertion direction of the first display element 11a. [Selection diagram] Figure 17

Description

The present invention relates to an image display device and an optical unit that enable observation of virtual images, and a method for manufacturing the optical unit.

As an image display device, a convex portion provided on either one of a display element holding member and a lens barrel housing a projection optical system, and a recessed portion provided on the other are used to hold the display element relative to the optical system. A device that performs positioning is known (Patent Document 1). In this device, the left and right optical systems are assembled into a metal frame in order to place the left eye optical system from the display element to the light guide member and the right eye optical system with a similar structure in front of the eyes. structure is used.

JP2017-211674A

In the apparatus of the above-mentioned background art, after the image element is aligned and fixed, it is necessary to fix the circuit board, the exterior, etc. to the lens barrel, etc., by tightening screws, for example, which may cause deformation of the lens barrel or the lens and Misalignment between panels occurs, resulting in deterioration of video quality.

Further, when assembling the left eye optical system and the right eye optical system to a metal frame, there is a possibility that the optical system for the left eye and the right eye are affected by manufacturing tolerances of the metal frame and assembly tolerances of the metal frame.

An image display device according to one aspect of the present invention includes a display element, a holder that holds the display element, a projection optical system that projects an image formed on the display element, and a projection optical system that is housed in a positioned state. The present invention includes a case having an insertion opening into which a display element supported by the display element is inserted, and a metal frame supporting the case, the metal frame having a reception opening larger than the outline of the holder when viewed from the insertion direction of the display element.

An image display device according to one aspect of the present invention includes a display element, a holder that holds the display element, a projection optical system that projects an image formed on the display element, and a case that stores the projection optical system in a positioned state. , a metal frame that supports the case, and the holder is connected to the support frame that is inserted into the case through an insertion opening formed in the case while supporting the display element, and the upper part of the support frame. The metal frame has a gripping aperture that exposes the base plate of the holder and an adhesive aperture that provides curing light to cure the adhesive connecting the holder and the case.

FIG. 2 is an external perspective view illustrating a state in which the image display device of the first embodiment is installed. FIG. 3 is a side cross-sectional view illustrating the internal structure of one display device. FIG. 3 is a side cross-sectional view specifically explaining the optical structure of the display section. It is a perspective view explaining the support structure of a display part. FIG. 2 is a plan view and a perspective view illustrating a metal frame that supports a display unit. It is a perspective view explaining the outline of a display part. It is a side sectional view of a barrel, an optical member etc. held by this. A rear view and a plan view of the remaining portion excluding the barrel cover are shown. FIG. 3 is an exploded perspective view of the barrel. They are a perspective view, a side view, etc. showing the arrangement relationship of a guard and a prism mirror. They are a front side perspective view, a side sectional view, and a back side perspective view showing the display unit. FIG. 3 is an enlarged sectional view of the front part of the barrel. FIG. 3 is a plan view of the optical unit. FIG. 3 is a front view and a plan view of the optical unit. FIG. 2 is a conceptual diagram illustrating a front cross-sectional structure of one side of the display device. It is a figure explaining the method of assembling a display unit to a barrel. FIG. 3 is a perspective view illustrating how the display unit is attached to the barrel. It is a perspective view explaining assembly of a display unit to a barrel. FIG. 7 is a partially enlarged sectional view illustrating a display unit in a second embodiment. It is a perspective view explaining the metal frame in 3rd embodiment. It is a figure explaining the method of assembling a display unit to a barrel etc. FIG. 3 is a perspective view illustrating how the display unit is assembled to a barrel or the like.

[First embodiment]
Hereinafter, a first embodiment of an image display device according to the present invention will be described with reference to FIGS. 1, 2, etc.

FIG. 1 is a diagram illustrating a state in which a head-mounted display (hereinafter also referred to as HMD) 200 is worn, and the HMD 200 allows an observer or wearer US wearing the HMD 200 to recognize an image as a virtual image. In FIG. 1 etc., X, Y, and Z are orthogonal coordinate systems, and the +X direction corresponds to the horizontal direction in which both eyes EY of the observer or wearer US wearing the HMD 200 or the image display device 100 are lined up, The +Y direction corresponds to the upward direction perpendicular to the lateral direction in which both eyes EY are lined up for the wearer US, and the +Z direction corresponds to the front direction or frontal direction for the wearer US. The ±Y direction is parallel to the vertical axis or vertical direction.

The HMD 200 includes a first display device 100A for the right eye, a second display device 100B for the left eye, a pair of temple-shaped support devices 100C that support the display devices 100A and 100B, and a user terminal 90 that is an information terminal. Equipped with. The first display device 100A functions independently as an HMD, and is composed of a first display drive section 102a disposed at the top and a first combiner 103a shaped like a spectacle lens and covering in front of the eyes. Similarly, the second display device 100B functions independently as an HMD, and is composed of a second display drive section 102b disposed at the top and a second combiner 103b shaped like a spectacle lens and covering in front of the eyes. The support device 100C is an attachment member that is attached to the head of the wearer US, and supports the upper end sides of the pair of combiners 103a and 103b via display drive units 102a and 102b that are integrated in appearance. . The first display device 100A and the second display device 100B are optically the same or left and right reversed, and a detailed description of the second display device 100B will be omitted.

FIG. 2 is a side sectional view illustrating the internal structure of the first display device 100A. The first display device 100A includes a first display element 11a, a first display section 20a, and a first circuit member 80a. The first display element 11a is an image light generating device, and is also called a video element. The first display section 20a is an imaging optical system that forms a virtual image, and has a projection lens 21, a prism mirror 22, and a see-through mirror 23 in an integrated state. In the first display section 20a, the projection lens 21 and the prism mirror 22 function as a first projection optical system 12a into which the image light ML from the first display element 11a enters, and the see-through mirror 23 functions as the first projection optical system 12a. It functions as a partially transmitting mirror 123 that partially reflects the image light ML emitted from the optical system 12a toward the pupil position PP or the eye EY. The first projection optical system 12a projects the image formed on the first display element 11a. The first display section 20a has a first projection optical system 12a and a first combiner 103a in an integrated state. The projection lens 21 constituting the first projection optical system 12a corresponds to the first optical member 2a arranged on the light exit side of the first display element 11a, and the prism mirror 22 corresponds to the first optical member which is the projection lens 21. This corresponds to the second optical member 2b disposed on the light exit side of 2a. Further, the first display element 11a, the projection lens 21, and the prism mirror 22 correspond to a part of the first display drive unit 102a shown in FIG. 1, and the see-through mirror 23 is located on the light exit side of the second optical member 2b. This corresponds to the first combiner 103a shown in FIG. The projection lens 21 and prism mirror 22 constituting the first projection optical system 12a are fixed in a container-shaped barrel 41 in a mutually positioned state together with the first display element 11a. The barrel 41 is a case CA in which the optical elements constituting the first projection optical system 12a are housed in a positioned state.

The barrel 41 that supports the optical members 2a and 2b constituting the first projection optical system 12a is supported by the first metal frame 52a and is disposed below the first metal frame 52a. The first metal frame 52a is covered by a cover 71, and the barrel 41 is also completely covered by the cover 71. The first metal frame 52a is made of a metal material. The barrel 41 and the cover 71 are made of a light-shielding resin material, and expose one surface of the prism mirror 22 at the exit port 41o of the barrel 41. The upper part 41q of the barrel 41 fits into the first metal frame 52a, and is fixed in a suspended state from the first metal frame 52a. As a result, the first display section 20a is suspended and fixed to the first metal frame 52a via the barrel 41. The first metal frame 52a has a recess RE for arranging the first circuit member 80a on the upper side.

In the first display device 100A, the first display element 11a is a self-luminous image light generation device. The first display element 11a emits the image light ML to the first projection optical system 12a. The barrel 41 accommodates and supports the first display element 11a together with the optical elements that constitute the first projection optical system 12a. The first display element 11a is, for example, an organic EL (Organic Electro-Luminescence) display, and forms a color still image or moving image on a two-dimensional display surface 11d. The first display element 11a performs a display operation by being driven by the first circuit member 80a and a display control device 88 including the first circuit member 80a. The first display element 11a is not limited to an organic EL display, but can be replaced with a display device using an inorganic EL, an organic LED, an LED array, a laser array, a quantum dot light-emitting element, or the like. The first display element 11a is not limited to a self-luminous image light generation device, but is composed of an LCD or other light modulation element, and forms an image by illuminating the light modulation element with a light source such as a backlight. It may be. As the first display element 11a, an LCOS (Liquid crystal on silicon, LCoS is a registered trademark), a digital micromirror device, or the like may be used instead of an LCD. Note that the first display device 100A excluding the display control device 88 or the first circuit member 80a is also referred to as the image display device 100.

FIG. 3 is a side sectional view specifically explaining the optical structure of the first display section 20a. The first display section 20a includes two reflective surfaces, and a see-through mirror 23 and a prism mirror 22 bend the optical path. The first display section 20a is an off-axis optical system OS. The projection lens 21, the prism mirror 22, and the see-through mirror 23 are arranged non-axially symmetrically. In this first display section 20a, by bending the optical axis AX within an off-axis plane parallel to the YZ plane that is a reference plane, the optical elements 21, 22, 23 are arranged. Specifically, on an off-axis plane parallel to the YZ plane and corresponding to the paper plane, an optical path portion P1 from the projection lens 21 to the reflective surface 22b, an optical path portion P2 from the reflective surface 22b to the see-through mirror 23, and the see-through mirror 23 The optical path portion P3 from to the pupil position PP is arranged to be folded back in two stages in a Z-shape. Correspondingly, an optical axis portion AX1 from the projection lens 21 to the reflective surface 22b, an optical axis portion AX2 from the reflective surface 22b to the see-through mirror 23, and an optical axis portion AX3 from the see-through mirror 23 to the pupil position PP. is arranged to be folded back in two stages in a Z-shape. In the see-through mirror 23, the normal line at the center where the optical axis AX intersects makes an angle of about θ=40 to 50° with respect to the Z direction. In the first display section 20a, the optical elements 21, 22, and 23 constituting the first display device 100A are arranged at different heights in the vertical direction, which reduces the width of the first display device 100A. It can be prevented. Further, the optical path portions P1 to P3 or the optical axis portions AX1 to AX3 are folded back in two steps in a Z-shape by folding the optical path due to reflection by the prism mirror 22, etc., and the optical path portions P1, P3 Alternatively, since the optical axis portions AX1 and AX3 are relatively close to horizontal, the first display section 20a can also be downsized in the vertical direction and the front-back direction. Furthermore, since the inclination angle θ at the center of the see-through mirror 23 is 40 to 50°, if the inclination of the optical path portion P3 corresponding to the line of sight is constant, the inclination of the optical path portion P2 with respect to the Z axis will vary from 70° to 90°. °, making it easy to reduce the thickness of the image display device 100 in the Z direction.

In the first display section 20a, an optical path portion P1 from the projection lens 21 to the reflective surface 22b extends in a direction slightly diagonally upward toward the rear with respect to the viewpoint or in a direction nearly parallel to the Z direction. The optical path portion P2 from the reflective surface 22b to the see-through mirror 23 extends obliquely downward toward the front. When the horizontal plane direction (XZ plane) is used as a reference, the inclination of the optical path portion P2 is larger than the inclination of the optical path portion P1. The optical path portion P3 from the see-through mirror 23 to the pupil position PP extends toward the rear in a slightly oblique upward direction or in a direction nearly parallel to the Z direction. In the illustrated example, the portion of the optical axis AX that corresponds to the optical path portion P3 is approximately -10° toward the +Z direction, with the downward direction being negative. That is, the partially transmitting mirror 123 reflects the image light ML so that the optical axis AX or the optical path portion P3 is directed upward at a predetermined angle, that is, about 10 degrees upward. As a result, the exit optical axis EX, which is an extension of the optical axis portion AX3 corresponding to the optical path portion P3, extends downwardly by approximately 10° with respect to the central axis HX parallel to the forward +Z direction. This is because the human line of sight is stabilized when the eyes are slightly lowered, tilted downward by about 10 degrees from the horizontal direction. Note that the central axis HX extending in the horizontal direction with respect to the pupil position PP is based on the assumption that the wearer US wearing the first display device 100A is relaxed in an upright position, facing forward, and gazing at the horizontal direction or the horizon line. It has become a thing.

In the first display section 20a, the projection lens 21 includes a first lens 21o, a second lens 21p, and a third lens 21q. The projection lens 21 receives the image light ML emitted from the first display element 11 a and makes it enter the prism mirror 22 . The projection lens 21 condenses the image light ML emitted from the first display element 11a into a nearly parallel beam. The entrance surface 21a and exit surface 21b of the first lens 21o that constitute the projection lens 21, the entrance surface 21c and exit surface 21d of the second lens 21p, and the entrance surface 21e and exit surface 21f of the third lens 21q are free. It is a curved or aspherical surface. Each of the optical surfaces 21a, 21b, 21c, 21d, 21e, and 21f has asymmetrical properties across the optical axis AX with respect to the vertical direction that is parallel to the YZ plane and intersects with the optical axis AX, and has asymmetrical properties with respect to the horizontal direction or the X direction. It has symmetry across the axis AX. The first lens 21o, the second lens 21p, and the third lens 21q are made of resin, for example, but may also be made of glass. An antireflection film can be formed on the optical surfaces of the first lens 21o, second lens 21p, and third lens 21q that constitute the projection lens 21.

The prism mirror 22 is an optical member having a refraction and reflection function, which has a combined function of a mirror and a lens, and reflects the image light ML from the projection lens 21 while refracting it. The prism mirror 22 has an incident surface 22a disposed on the light exit side of the first optical member, a reflective surface 22b that bends the optical axis AX, and an incident surface 22a facing the reflective surface 22b and arranged in a symmetrical direction. and an exit surface 22c. The prism mirror 22 returns the image light ML that enters from the front where the projection lens 21 is arranged in a direction that is inclined downward with respect to the direction in which the direction of incidence is reversed (the direction of the light source as seen from the prism mirror 22). eject into. The entrance surface 22a, the reflection surface 22b, and the exit surface 22c, which are optical surfaces constituting the prism mirror 22, have asymmetry across the optical axis AX with respect to the vertical direction parallel to the YZ plane and intersecting the optical axis AX. , has symmetry across the optical axis AX with respect to the lateral direction or the X direction. The optical surfaces of the prism mirror 22, that is, the entrance surface 22a, the reflection surface 22b, and the exit surface 22c, are, for example, free-form surfaces. The entrance surface 22a, the reflection surface 22b, and the exit surface 22c are not limited to free-form surfaces, but may also be aspherical surfaces. The prism mirror 22 is made of resin, for example, but may also be made of glass. The reflective surface 22b is not limited to one that reflects the image light ML by total reflection, but may also be a reflective surface made of a metal film or a dielectric multilayer film. In this case, a reflective film made of a single layer or a multilayer film made of a metal such as Al or Ag is formed by vapor deposition on the reflective surface 22b, or a sheet-like reflective film made of a metal is formed on the reflective surface 22b. Paste. Although detailed illustration is omitted, an antireflection film can be formed on the entrance surface 22a and the exit surface 22c.

The exit surface 22c of the prism mirror 22 is entirely concave, and is concave on the off-axis surface parallel to the YZ plane and through which the optical axis portions AX1 to AX3 pass, that is, on the plane of the paper, and is perpendicular to the YZ plane and is concave on the exit surface 22c. It is also a concave surface in the cross section CS (see FIG. 2) passing through the center. Since the exit surface 22c of the prism mirror 22 is exposed at the exit port 41o of the barrel 41, by making it a concave surface, contact with external objects can be easily avoided and damage can be suppressed. The exit surface 22c of the prism mirror 22 is disposed near the relatively small intermediate image IM, and is disposed at a location where the beam cross section of the image light ML is narrowed, so the area can be made relatively small. Damage to the exit surface 22c can also be suppressed by making the area of the exit surface 22c of the prism mirror 22 relatively small.

The see-through mirror 23, that is, the first combiner 103a is a curved plate-shaped reflective optical member that functions as a concave surface mirror, and reflects the image light ML from the prism mirror 22 and partially transmits the external light OL. See-through mirror 23 reflects image light ML from prism mirror 22 toward pupil position PP. See-through mirror 23 has a reflective surface 23c and an outer surface 23o.

See-through mirror 23 partially reflects image light ML. The see-through mirror 23 is a concave mirror that covers the eye EY or the pupil position PP where the pupil is located, has a concave shape toward the pupil position PP, and has a convex shape toward the outside world. The pupil position PP or its aperture PPa is called an eye point or an eye box. The pupil position PP or the aperture PPa corresponds to the exit pupil EP on the exit side of the first display section 20a. The see-through mirror 23 is a collimator, and is a principal ray of the image light ML emitted from each point on the display surface 11d, after being imaged near the exit side of the prism mirror 22 of the first projection optical system 12a. The chief ray of the spread image light ML is converged on the pupil position PP. The see-through mirror 23, as a concave mirror, enables an enlarged view of the intermediate image IM formed on the first display element 11a, which is an image light generating device, and re-imaged by the first projection optical system 12a. More specifically, the see-through mirror 23 functions similarly to a field lens, and collimates the image light ML from each point of the intermediate image IM formed at the rear of the exit surface 22c of the prism mirror 22. Inject it so that it collects as a whole. The see-through mirror 23 is disposed between the intermediate image IM and the pupil position PP, and needs to have a width larger than the effective area EA corresponding to the angle of view. Here, the angle of view is the sum of the viewing angles in the upper, lower, left, and right directions with respect to the optical axis AX extending in the front direction of the eye, and is set to about 40 to 50 degrees in a specific example. In the see-through mirror 23, the outer area extending outside the effective area EA can have any surface shape as it does not directly affect image formation, but from the viewpoint of ensuring the appearance of a spectacle lens, It is desirable that the curvature be the same as the curvature of the surface shape of the outer edge of the area EA, or that it changes continuously from the outer edge.

The see-through mirror 23 is a semi-transparent mirror plate having a structure in which a transparent reflective film 23a is formed on the back surface of a plate-shaped body 23b. The reflective surface 23c of the see-through mirror 23 has asymmetrical properties across the optical axis AX with respect to the vertical direction that is parallel to the YZ plane and intersects with the optical axis AX, and is symmetrical with respect to the horizontal direction or the X direction across the optical axis AX. has. The reflective surface 23c of the see-through mirror 23 is, for example, a free-form surface. The reflective surface 23c is not limited to a free-form surface, but may also be an aspherical surface. The reflective surface 23c needs to have an extent larger than the effective area EA. When the reflective surface 23c is formed in an outer area wider than the effective area EA, a difference in appearance is unlikely to occur between an external world image from behind the effective area EA and an external world image from behind the external area. .

The reflective surface 23c of the see-through mirror 23 allows part of the light to pass through when reflecting the image light ML. As a result, the outside world light OL passes through the see-through mirror 23, so that see-through viewing of the outside world is possible, and a virtual image can be superimposed on the outside world image. At this time, if the plate-like body 23b is thin to several millimeters or less, the change in magnification of the external image can be kept small. The reflectance of the reflecting surface 23c for the image light ML and the external world light OL is determined based on the assumed incident angle range (effective area (equivalent to EA) shall be 10% or more and 50% or less. The plate-shaped body 23b, which is the base material of the see-through mirror 23, is made of resin, for example, but it can also be made of glass. The plate-like body 23b is made of the same material as the support plate 61 that supports it from the periphery, and has the same thickness as the support plate 61. The transparent reflective film 23a is formed of, for example, a dielectric multilayer film composed of a plurality of dielectric layers with adjusted film thicknesses. The transparent reflective film 23a may be a single layer film or a multilayer film of metal such as Al or Ag with adjusted film thickness. The transparent reflective film 23a can be formed by laminating layers using vapor deposition, for example, but it can also be formed by pasting a sheet-like reflective film. An antireflection film is formed on the outer surface 23o of the plate-like body 23b.

To explain the optical path, the image light ML from the first display element 11a enters the projection lens 21 and is emitted from the projection lens 21 in a substantially collimated state. The image light ML that has passed through the projection lens 21 enters the prism mirror 22, passes through the entrance surface 22a while being refracted, is reflected by the reflection surface 22b with a high reflectance close to 100%, and is refracted again at the exit surface 22c. Ru. The image light ML from the prism mirror 22 once forms an intermediate image IM, and then enters the see-through mirror 23 and is reflected by the reflective surface 23c with a reflectance of about 50% or less. The image light ML reflected by the see-through mirror 23 enters the eye EY or pupil position PP of the wearer US where the pupil is located. External light OL that has passed through the see-through mirror 23 and the support plate 61 around it also enters the pupil position PP. That is, the wearer US wearing the first display device 100A can observe a virtual image created by the image light ML, superimposed on the external world image.

Returning to FIG. 2, the display control device 88 or the first circuit member 80a is a display control circuit, and outputs a drive signal corresponding to an image to the first display element 11a to control the display operation of the first display element 11a. Control. The display control device 88 includes, for example, an IF circuit, a signal processing circuit, etc., and causes the first display element 11a to display a two-dimensional image according to image data or image signals received from the outside. The display control device 88 may include a main board that controls the first display device 100A and the second display device 100B. The display control device 88 or the main board has an interface function of communicating with the user terminal 90 shown in FIG. 1 and converting signals received from the user terminal 90, and a display operation of the first display device 100A. It may have an integrated function that links the display operation of the second display device 100B. Note that the HMD 200 or the image display device 100 that does not include the display control device 88 or the user terminal 90 is also an image display device.

With reference to FIG. 4, the support structure built into the display drive units 102a, 102b of the HMD 200 will be described. In the first display device 100A, the first metal frame 52a is fixed to the barrel 41 of the first display section 20a using a fastener 50f such as a screw, and is configured to hang the first display section 20a. I support it. A rectangular opening 52o is formed as a receiving opening OR in the first metal frame 52a, and a part of the periphery 52r of the rectangular opening 52o comes into close contact with the upper part 41q of the barrel of the first display section 20a. Note that the first circuit member 80a is arranged in the recess RE on the first metal frame 52a. The first metal frame 52a is made of, for example, a magnesium alloy. In the second display device 100B, the second metal frame 52b is fixed to the barrel 41 of the second display section 20b using a fastener 50f such as a screw, and is configured to hang the second display section 20b. I support it. A rectangular opening 52o is formed as a receiving opening OR in the second metal frame 52b, and a part of the periphery 52r of the rectangular opening 52o contacts and closely contacts the barrel cover 41u of the second display section 20b.

The first metal frame 52a and the second metal frame 52b are not limited to being made of a magnesium alloy, but may be made of an alloy containing one or more of magnesium, manganese, aluminum, and titanium. This type of alloy is desirable from the viewpoint of increasing the rigidity of the metal frames 52a and 52b while reducing their weight. In particular, magnesium alloy is one of the most excellent alloys in terms of rigidity, weight reduction, thermal conductivity, etc. Magnesium alloys also have high vibration damping capabilities. The metal frames 52a and 52b are coated with a black surface coating. In other words, the metal frames 52a and 52b have black surfaces painted or plated to enhance the heat dissipation effect by radiation from the surfaces. By applying a black surface coating to the metal frames 52a and 52b, the metal frames 52a and 52b can also have the role of suppressing the generation of stray light. The durability against corrosion can also be increased by subjecting the metal frames 52a and 52b to surface treatment.

FIG. 5 is a diagram illustrating the first metal frame 52a. In FIG. 5, area AR1 is a plan view of the first metal frame 52a, and area AR2 is a perspective view of the back side of the first metal frame 52a. The first metal frame 52a includes a generally rectangular flat plate portion 55a having an opening 52o, and a pair of reinforcing protrusions 55b and 55c that protrude upward from the flat plate portion 55a. The first reinforcing protrusion 55b arranged on the front side, which is the +Z side, is provided along the front side of the pair of sides extending in the longitudinal direction of the flat plate part 55a, on the outer edge of the flat plate part 55a. The first reinforcing protrusion 55b protrudes on the upper side, which is the +Y side, and the lower side, which is the -Y side, and extends in the horizontal X direction as a whole while being slightly curved. Further, the second reinforcing protrusion 55c arranged on the rear side, which is the -Z side, is provided along the rear side of the pair of sides extending in the longitudinal direction of the flat plate part 55a, among the outer edges of the flat plate part 55a. It is being The second reinforcing protrusion 55c protrudes only on the upper side, which is the +Y side, and extends in the lateral X direction as a whole while being slightly curved. The pair of reinforcing projections 55b and 55c increase the structural strength of the first metal frame 52a, and increase the strength of the flat plate portion 55a, which is relatively weak against bending and torsion.

A hole 56a formed at one end of the first metal frame 52a is used to connect the first metal frame 52a to a joint 50c shown in FIG. 4. A hole 56j formed at the other end of the first metal frame 52a is used to connect the first metal frame 52a to the cover 71 (see FIG. 2) or its accessories. Holes 56b formed at four locations around the opening 52o in the first metal frame 52a are used to fix the first metal frame 52a to the upper part 41q of the barrel 41. That is, the first metal frame 52a can be stably fixed to the upper part 41q of the barrel 41 by screwing the fastener 50f shown in FIG. 4 into the fastening part 51f shown in FIG. 5 through the hole 56b. The barrel 41 is fixed so as to hang around the opening 52o of the first metal frame 52a, but at this time, the upper part 41q of the barrel 41 is partially exposed. As a result, the first metal frame 52a can be used when attaching and adjusting the first display element 11a, which will be described later, and the barrel 41 can be easily supported, and in the process after attaching the first display element 11a, Chances of unnecessary stress or impact being applied to the barrel 41 can be reduced, making it easier to achieve good image quality.

In the first metal frame 52a, the space above the flat plate portion 55a and sandwiched between the pair of reinforcing protrusions 55b and 55c is a recess RE that can accommodate the first circuit member 80a. Note that the height of the upper end of the first circuit member 80a may be higher than the height of the upper ends of the pair of reinforcing projections 55b and 55c. In the first metal frame 52a, screw holes 56c formed at three locations around the opening 52o are used to fix the first circuit member 80a to the first metal frame 52a. The FPC portion 11f (see FIG. 7) extending from the first display element 11a is passed through the opening 52o of the first metal frame 52a in a region near the front reinforcing projection 55b and guided to the recess RE.

Although not shown, the second metal frame 52b has a shape and structure that is reversed in the left-right direction, that is, in the ±X direction, of the first metal frame 52a. Note that the first metal frame 52a itself may have a symmetrical shape, and in this case, the second metal frame 52b has the same shape as the first metal frame 52a without being reversed.

The outline shape of the flat plate portion 55a of the first metal frame 52a does not need to be rectangular, and can be changed as appropriate depending on the shape of the barrel 41 and its use. The shape of the opening 52o also does not need to be rectangular. The pair of reinforcing protrusions 55b and 55c are not limited to extending along the long sides of the flat plate part 55a, but may extend along a part of the long sides of the flat plate part 55a, and may extend along sides other than the long sides. It may extend along the length, or it may be provided in a rib shape inside other than the sides. The height and width of the pair of reinforcing protrusions 55b and 55c can also be changed as appropriate in consideration of the strength required of the first metal frame 52a, and the height and width can also be changed depending on the position.

Returning to FIG. 4, the support device 50 includes, in addition to the first metal frame 52a and the second metal frame 52b, a joint 50c that connects and relatively fixes the first metal frame 52a and the second metal frame 52b. Be prepared. The joint 50c is a metal member such as a magnesium alloy, and is connected to one end of the first metal frame 52a using a fastener 50g or the like, and is connected to one end of the second metal frame 52b using a fastener 50g or the like. connected to the other end. The first metal frame 52a to which the first display part 20a is attached and the second metal frame 52b to which the second display part 20b is attached are fixed in a mutually optically positioned state via a central joint 50c. has been done. The joint 50c is not limited to being made of a magnesium alloy, but may be made of an alloy containing one or more of magnesium, manganese, aluminum, and titanium.

FIG. 6 is a perspective view illustrating a state in which the support device 50 is removed from the HMD 200 shown in FIG. 4. The first display section 20a has the first projection optical system 12a and the first combiner 103a in an integrated state, and the second display section 20b has the second projection optical system 12b and the second combiner 103b. It is held in an integrated state. In the first projection optical system 12a, a first combiner 103a is fixed to the barrel 41 by adhesive or the like in a positioned state. The barrel 41 of the first projection optical system 12a has a space for housing the first display element 11a, and the first display element 11a is attached to the projection lens shown in FIG. 2 via the holder 31 that holds the first display element 11a. 21, etc., while being positioned. In the second projection optical system 12b, a second combiner 103b is fixed to the barrel 41 by adhesive or the like in a positioned state. The barrel 41 of the second projection optical system 12b has a space for housing the second display element 11b, and the second display element 11b is attached to the projection lens shown in FIG. 2 via the holder 31 that holds the second display element 11b. 21 etc. and support it in a positioned state. Each barrel 41 is provided with a plurality of fastening portions 51f for screwing to the first metal frame 52a or the second metal frame 52b shown in FIG. 4.

The structure of the barrel 41 will be described with reference to FIGS. 7 and 8. In FIG. 7, region BR1 is a side cross-sectional view of the barrel 41, the first display element 11a and optical members 2a, 2b held therein, and region BR2 is a side sectional view of the barrel 41 and the first display element 11a and optical members 2a, 2b, excluding the first display element 11a and the holder 31. Region BR3 is a side sectional view of the state in which the barrel cover 41u is further removed. Further, in FIG. 8, region CR1 is a rear view with barrel cover 41u removed, and region CR2 is a plan view of the rear end with barrel cover 41u removed.

The barrel 41 includes a barrel main body 41a and a barrel cover 41u, houses the first optical member 2a, and holds the second optical member 2b. The barrel body 41a and the barrel cover 41u are made of polycarbonate resin in consideration of the support precision and strength of the optical elements fixed therein. The barrel main body 41a is a bathtub-shaped container with an open upper part, and has an injection port 41o in a part of the bottom. The barrel cover 41u is fixed so as to cover the barrel body 41a from above. The barrel body 41a has two side plate members 41c, a bottom plate member 41d, a front plate member 41e, and two protrusions 41f and 41g. The two side plate members 41c extend substantially parallel to the off-axis surface HS (see FIG. 8) along which the optical axis AX extends and are spaced apart from each other. The bottom plate member 41d extends substantially along an XZ plane perpendicular to the off-axis surface HS along which the optical axis AX extends, and is provided with an exit port 41o on the rear end side. The front plate member 41e connects the front end of the bottom plate member 41d and the front ends of the two side plate members 41c. The two protrusions 41f and 41g extend laterally so as to project outward from the upper portions of the two side plate members 41c.

On the inside of one side plate member 41c, there are protrusions that support the first lens 21o, second lens 21p, and third lens 21q that constitute the first optical member 2a, and the prism mirror 22 of the second optical member 2b. , guide protrusions 45a, 45b, 45c, and 45d having steps are formed. Although not shown, guide protrusions similar to the guide protrusions 45a, 45b, 45c, and 45d are also formed on the inner surface of the other side plate member 41c (see FIG. 8). The first lens 21o is positioned in a biased state by the two first guide protrusions 45a provided on the inner surfaces of the two side plate members 41c, and is supported by the barrel body 41a. Similarly, the second lens 21p is positioned by the second guide protrusion 45b and supported by the barrel body 41a, and the third lens 21q is positioned by the third guide protrusion 45c and supported by the barrel body 41a. The prism mirror 22 is positioned by the guide protrusion 45d of No. 4 and supported by the barrel body 41a.

The barrel cover 41u is disposed on the opposite side of the bottom plate member 41d and forms a storage space IS by covering the inside of the barrel body 41a. The barrel cover 41u includes a top plate 41x and a rear plate 41y. The top plate 41x extends parallel to the XZ plane, and the rear plate 41y is arranged to be inclined so as to cover the outside of the reflective surface 22b of the prism mirror 22 of the second optical member 2b. In the barrel cover 41u, a positioning holder pedestal 41s lowered by a predetermined height from the surroundings is formed on the front +Z side, and an insertion opening 41z is formed in the front of the holder pedestal 41s. The holder base 41s provided on the barrel cover 41u faces the base plate 31b of the holder 31 after assembly, as will be described later. The base plate 31b is fixed to the barrel 41 while covering the insertion port 41z. In this case, the base plate 31b and the side surface SP of the barrel 41 extend substantially in parallel, making it possible to increase the area of the base plate 31b while preventing the base plate 31b from becoming bulky after assembly. The top plate 41x of the barrel cover 41u, the two side plate members 41c of the barrel body 41a, and the bottom plate member 41d of the barrel body 41a are a side surface part SP of the barrel 41 that extends in the Z direction as a whole. The inner surface 41m of the rear plate 41y is inclined with respect to the XZ plane and the XY plane, and extends along the reflective surface 22b of the prism mirror 22 near the reflective surface 22b. A uniform gap GA is formed between the outside of the reflective surface 22b and the inner surface 41m of the rear plate 41y.

A plane substantially parallel to the XZ plane, which is an extension of the seat surface 41n (see FIG. 12), which is the second surface formed on the holder base 41s of the barrel cover 41u, intersects the upper part 22j of the second optical member 2b. This means that the seat surface 41n is formed low. By forming the holder base 41s at a position recessed toward the center of the barrel 41, the amount of protrusion of the base plate 31b from the holder 31 can be suppressed.

As shown in FIG. 9, fitting structures 47a and 47b, such as steps, are provided between the outer edge 42q extending along the outer periphery of the barrel cover 41u and the upper end 42p of the barrel body 41a, to facilitate mutual positioning. It can be achieved. The outer edge 42q of the barrel cover 41u and the upper end 42p of the barrel body 41a form a connecting portion CJ between the barrel body 41a and the barrel cover 41u. In the connecting portion CJ, a sealing material that functions as an adhesive or a sealing material is provided in the gap between the outer edge 42q of the barrel cover 41u and the upper end 42p of the barrel body 41a, that is, the gap between the fitting structures 47a, 47b and the outer edge 42q or the upper end 42p. The member SM is filled (see area AR2 in FIG. 7). In this case, the confidentiality of the storage space IS can be increased. The sealing member SM has a dustproof structure DP.

Referring to FIGS. 7 and 8, a diaphragm plate member 26 is disposed within the barrel 41 between the first optical member 2a and the second optical member 2b. The aperture plate member 26 is located between the first image element 11a and the intermediate image IM (see FIG. 3), at or near the intermediate pupil position where the diameter of the luminous flux from each point on the display surface 11d is largest. It is desirable that it be placed. In the illustrated case, the aperture plate member 26 is attached adjacent to the entrance surface 22a of the prism mirror 22. Referring to FIG. 8, the aperture plate member 26 includes a central portion 26a disposed near the bottom plate member 41d of the barrel 41, and two side portions 26b extending from the central portion 26a along two side plate members 41c. has. In the case of this embodiment, the area up to the upper part 22j of the prism mirror 22 is an optically effective area. For this reason, the aperture plate member 26 is an open type having a central portion 26a corresponding to the lower side and side portions 26b corresponding to the left and right sides, with the upper side omitted.

The diaphragm plate member 26 has notches 26f at four locations around the periphery, and the notches 26f fit with four protrusions 22f formed on the side surface 22s outside the entrance surface 22a of the prism mirror 22. . Thereby, the aperture plate member 26 is positioned with respect to the entrance surface 22a of the prism mirror 22. The aperture plate member 26 is fixed to the protrusion 22f with an adhesive around the notch 26f.

Fixing of the second optical member 2b or prism mirror 22 within the barrel 41 will be explained. The prism mirror 22 has a protrusion 22t on a pair of side surfaces 22s sandwiched between an entrance surface 22a, a reflection surface 22b, and an exit surface 22c. A pair of first support surfaces 28a on the entrance surface 22a side of the protrusion 22t are in contact with a pair of first mounting surfaces 48a provided on a guide protrusion 45d formed on the barrel body 41a. A pair of second support surfaces 28b on the injection surface 22c side of the projection 22t are in contact with a pair of second mounting surfaces 48b provided on a guide protrusion 45d formed on the barrel body 41a. A pair of outward third support surfaces 28c provided below the protrusion 22t on the side surface 22s are a pair of inward third mounting surfaces 48c provided on a guide convex portion 45d formed on the barrel body 41a. is in contact with. By using the contact between the first support surface 28a and the first mounting surface 48a, it is possible to position the prism mirror 22 with respect to the position in the Z direction and the inclination around the Y and X axes. By using the contact between the second support surface 28b and the second mounting surface 48b, it is possible to position the prism mirror 22 with respect to the position in the Y direction and the inclination around the Z axis. By using the contact between the third mounting surface 48c and the third mounting surface 48c, the prism mirror 22 can be positioned in the X direction. When assembling the prism mirror 22 to the barrel body 41a, the barrel body 41a is placed vertically so that the guide protrusion 45d or the injection port 41o is on the upper side. After that, the adhesive AM is applied to appropriate places on the first mounting surface 48a, the second mounting surface 48b, and the third mounting surface 48c of the guide projections 45d, so that the pair of projections 22t are attached to the pair of guide projections 45d. Insert the prism mirror 22 like a drawer so that it rests on it. By curing the adhesive AM of each part after the positioning is completed, the prism mirror 22 can be precisely fixed to the barrel body 41a. As the adhesive material AM, for example, a UV-curable adhesive material can be used, but the present invention is not limited thereto.

The method for positioning and fixing the prism mirror 22 to the guide protrusion 45d formed on the barrel body 41a has been described above. The method of fixing to the guide protrusion 45a, the second guide protrusion 45b, and the third guide protrusion 45c is also the same as that for the prism mirror 22, and the explanation will be omitted. Regarding the assembly order, first fix the first lens 21o to the barrel body 41a, then fix the second lens 21p to the barrel body 41a, then fix the third lens 21q to the barrel body 41a, and finally fix the prism mirror. 22 is fixed to the barrel body 41a.

The method of fixing the prism mirror 22 and the like to the barrel main body 41a is not limited to the method using the above-mentioned offset method, but may be replaced by methods using various methods such as fitting.

With reference to FIG. 10, the vicinity of the injection port 41o of the barrel 41 will be described. In FIG. 10, region DR1 is a perspective view explaining the vicinity of the injection port 41o, region DR2 is a side view explaining the vicinity of the injection port 41o, and region DR3 is a side view explaining the vicinity of the injection port 41o. FIG. A guard 43a is formed around the injection port 41o provided at the rear of the bottom plate member 41d of the barrel 41 so as to protrude from the bottom of the barrel 41. The guard 43a protects the side surface of the prism mirror 22 that protrudes below the main body 41j of the bottom plate member 41d. Guard 43a has an inclined rear portion 43c and side portions 43d. An inclined injection port 41o is formed surrounded by the guard 43a and the main body 41j. The injection port 41o is inclined several tens of degrees in the forward +Z direction with respect to the downward −Y direction as a reference. A rectangular annular edge 44 provided around the exit port 41o is arranged to surround the outer edge 22cp of the exit surface 22c of the prism mirror 22. The edge 44 of the injection port 41o includes a portion 44a corresponding to the rear portion 43c of the guard 43a, a portion 44b corresponding to the side portion 43d of the guard 43a, and a portion 44c corresponding to the main body 41j of the bottom plate member 41d. The edge 44 provided around the exit port 41o protects the exit surface 22c of the prism mirror 22 from the surroundings by surrounding the outer edge 22cp of the exit surface 22c of the prism mirror 22 from the outside. At this time, the outer edge 22cp of the exit surface 22c of the prism mirror 22 is arranged on the inside retreating from the edge 44 of the exit port 41o. That is, the exit surface 22c of the prism mirror 22 is located further back than the edge 44 of the exit port 41o. Specifically, the upper end of the outer edge 22cp of the exit surface 22c of the prism mirror 22 is lower than the upper end of the edge 44 of the exit port 41o by about 0.5 mm to several mm to +Y. Thereby, it is possible to prevent an unintended object from hitting or touching the outer edge 22cp of the prism mirror 22, and it is possible to suppress deterioration of the exit surface 22c.

Referring to FIGS. 7 and 10, there is a gap between the outer edge 22cp of the exit surface 22c of the prism mirror 22 and the edge 44 of the exit port 41o. It is filled with a functional sealing member SM. The sealing member SM seals between the exit port 41o of the barrel body 41a and the second optical member 2b or the periphery of the exit surface 22c of the prism mirror 22. In this case, the exit surface 22c of the second optical member 2b is exposed to the outside, but the optical surface optically upstream of the exit surface 22c of the second optical member 2b is protected by the dustproof and waterproof part of the barrel 41. . The sealing member SM filled along the injection port 41o of the barrel body 41a is an elastic adhesive AO. The elastic adhesive AO is an acrylic modified silicone resin that is cured by curing light such as UV light, for example, by being left at room temperature, and remains elastic even after curing. The elastic adhesive AO makes the injection port 41o dustproof and waterproof. The guard 43a surrounding the injection port 41o protrudes below the bottom plate member 41d, has a high possibility of coming into contact with an external object, and is highly likely to receive an external impact. For this reason, by providing an elastic adhesive AO between the exit surface 22c of the prism mirror 22 and the exit port 41o of the barrel 41 for sealing, the exit surface 22c of the prism mirror 22, etc. can be made impact resistant. , making it easy to maintain optical performance.

Referring to FIG. 7, in the barrel 41, the first display element 11a supported by the holder 31 is inserted from above through the insertion opening 41z into the space ISa facing the front plate member 41e, and is in a positioned state. Fixed. In this case, the first display element 11a is disposed within the barrel 41, making it less susceptible to external shocks, and making it less likely that misalignment will occur due to operational errors in the manufacturing process.

FIG. 11 is a diagram illustrating a display unit DU in which the first display element 11a is assembled to the holder 31. In FIG. 11, region ER1 is a perspective view showing the front side of display unit DU, region ER2 is a side cross section of display unit DU, and region ER3 is a perspective view showing the back side of holder 31.

In the illustrated display unit DU, the first display element 11a and the light shielding plate 33 attached thereto are fixed to a holder 31 and positioned with respect to each other.

The first display element 11a includes a plate-shaped main body portion 11k and an FPC (Flexible Printed Circuits) portion 11f connected to the upper part of the main body portion 11k and extending upward. Of these, the main body portion 11k is an organic EL element that includes a silicon substrate SS on which a drive circuit 11j is formed and forms the outer shape of the main body portion 11k, and an organic EL material, and is a color light source that is to become image light ML. It includes a light-emitting layer 11e that generates light, and a sealing protective glass GG that cooperates with the silicon substrate SS to seal the light-emitting layer 11e. Here, the light emitting layer 11e corresponds to the display surface 11d. The first display element 11a emits image light ML toward the protective glass GG by performing a light emitting operation according to the drive signal received from the FPC section 11f. An elastic heat dissipation sheet 11s can be attached to the back surface SSa of the silicon substrate SS. The heat dissipation sheet 11s is, for example, a heat dissipation member RM made of graphite, and is adhered to the back surface SSa of the silicon substrate SS using an adhesive with high thermal conductivity. Although not shown, the heat dissipation sheet 11s is fixed to the first metal frame 52a (see FIG. 4) at its tip end, and has the effect of cooling the silicon substrate SS by thermal conduction. The heat dissipation sheet 11s can have a laminated structure in which a plurality of sheets are laminated together.

The holder 31 is a member made of, for example, a light-shielding resin, and has an L-shaped outer shape when viewed from the side. The holder 31 includes a support frame 31a that supports the first display element 11a, and a base plate 31b that is connected to the upper part of the support frame 31a and extends in a direction intersecting (specifically, perpendicular to) the support frame 31a. . The support frame 31a is inserted into the barrel 41 through an insertion opening 41z formed in the barrel 41 while supporting the first display element 11a (see FIG. 7). The base plate 31b is connected to the base side of the support frame 31a, extends forward corresponding to the light exit side (ie, -Z side), and is not inserted into the barrel 41. The support frame 31a has a rectangular outer shape and includes a flat plate portion 31s and a frame portion 31t. The flat plate portion 31s is connected to the base plate 31b at its upper end. The frame portion 31t is U-shaped and surrounds the first display element 11a from the left and right and from below. The support frame 31a has a rectangular opening A1 surrounded by a flat plate portion 31s and a frame portion 31t. The protective glass GG of the first display element 11a is arranged to fit into the opening A1. Inside the support frame 31a, two support regions 31p extending in parallel to the horizontal X direction are formed at the upper and lower parts in the Y direction. The upper support region 31p is formed as a protrusion on the back side of the flat plate portion 31s, and the lower support region 31p is formed as a step on the back side of the frame portion 31t. Both support regions 31p are bonded to upper and lower surface regions SSc of the silicon substrate SS of the first display element 11a via an adhesive. As a result, the first display element 11a is indirectly positioned and supported with respect to the support frame 31a, and the display surface 11d of the first display element 11a is positioned at a predetermined position substantially parallel to the XY plane. be able to. The base plate 31b of the holder 31 has a rectangular flat outer shape, and the lower surface 31j extends parallel to the YZ plane. The base plate 31b is placed on a holder pedestal 41s formed on the barrel cover 41u of the barrel 41, and is fixed to the holder pedestal 41s after positioning (see FIG. 7, etc.). As a result, the lower surface 31j, which is the first surface formed on the base plate 31b, and the seat surface 41n, which is the second surface formed on the holder pedestal 41s, face each other, and the lower surface 31j, which is the first surface formed on the base plate 31b, faces each other, and A plane substantially parallel to the XZ plane, which is an extension of the lower surface 31j, which is one surface, intersects with the upper part 22j of the second optical member 2b and also intersects with the upper part of the third lens 21q. At the outer circumferential portion of the base plate 31b, thin portions 35t are formed on three sides: the rear side, that is, the −Z side, and the lateral direction, that is, the ±X side. The upper surface 31u of the base plate 31b is smooth and flat in order to facilitate support by an arm of a three-dimensional drive device to be described later.

The process of fixing the first display element 11a to the support frame 31a of the holder 31 will be briefly described. The support frame 31a is placed on a support jig (not shown) with the front side, that is, the -Z side facing down. Thereby, the reference surface of the support jig comes into contact with the contact surface 36d of the support frame 31a. After that, an adhesive is supplied to the surface of the support region 31p, the first display element 11a with the protective glass GG on the lower side is lowered from above the support frame 31a, and the protective glass GG is inserted into the opening A1 of the support frame 31a. . In this state, the reference surface of the support jig comes into contact with the surface GGa of the protective glass GG, and the first display element 11a is positioned with respect to the support frame 31a. Thereafter, the first display element 11a is fixed to the support frame 31a by curing the adhesive.

The light shielding plate 33 is fixed to the support frame 31a of the holder 31 using an adhesive or an adhesive material. The light-shielding plate 33 is a light-shielding aperture provided with a rectangular opening 33p, and is made of metal, resin, or the like having light-shielding properties. The light shielding plate 33 can suppress the generation of stray light. Effective image light ML emitted from the display surface 11d of the first display element 11a passes through the aperture 33p without being blocked by the light shielding plate 33. When fixing the light shielding plate 33, four protrusions 31q formed on the support frame 31a can be used for positioning. The four protrusions 31q grip protrusions 33c formed left and right from the light shielding plate 33 from above and below, and the light shielding plate 33 is properly positioned with respect to the support frame 31a. By using the plurality of protrusions 31q, the light shielding plate 33 is easily fixed in a space-saving manner. The light shielding plate 33 can be permanently fixed to the support frame 31a by using an adhesive.

Fixing of the display unit DU to the barrel 41 will be described with reference to FIGS. 12 and 13. FIG. 12 is an enlarged sectional view illustrating the optical unit 300, and FIG. 13 is a diagram illustrating the assembly of the optical unit 300. In FIG. 13, region FR1 is a plan view showing a state where display unit DU is assembled to barrel 41, and region FR2 is a plan view showing a state before display unit DU is assembled. Here, the display unit DU including the first display element 11a is assembled to the first display section 20a, which is a combination of the barrel 41 containing the first projection optical system 12a and the first combiner 103a. It is called unit 300.

Steps S1 are formed on the left and right and rear edge portions 41r of the holder base 41s formed on the top plate 41x of the barrel cover 41u, which is the upper surface of the barrel 41. That is, the height of the initial contact surface 49p, which is the upper surface of the holder base 41s or the seat surface 41n, is lower than the height of the upper surface 49c of the top plate 41x. The step S1 of the holder base 41s and its vicinity hold the adhesive AM1 that connects the holder 31 and the barrel 41. The adhesive AM1 is, for example, an acrylic ultraviolet curing resin. After positioning the holder 31, which will be described later, the adhesive AM1 is cured.

When the lower end of the support frame 31a of the holder 31 of the display unit DU is inserted through the insertion opening 41z and the entire support frame 31a is entered into the barrel 41 together with the first display element 11a, the first display element 11a is placed in the space ISa. The base plate 31b is placed so as to fit into the recessed holder base 41s. At this time, most of the insertion opening 41z is blocked by the base plate 31b, thereby suppressing dust and dust from entering into the holder 31. Further, when the base plate 31b is placed on the holder base 41s, the initial contact surface 49p, which is the seat surface 41n of the holder base 41s, and the initial contact surface 39p, which is the lower surface 31j of the base plate 31b, come into contact with each other. , an initial positioning state is reached in which the center of the display surface 11d of the first display element 11a is at the same position as the optical axis AX of the first optical member 2a toward the first lens 21o or is lowered by a predetermined distance. In other words, when adjusting after the initial stage, the holder 31 can be moved upward in the +Y direction relative to the barrel 41, and precise positioning in the Y direction can be achieved by finely adjusting the amount of movement of the holder 31 in the +Y direction. Become.

The base plate 31b of the holder 31 has thin portions 35t at the left, right and rear edge portions. The thin portion 35t forms a step S2 toward the step S1 of the holder base 41s. As a result, the groove TR is formed by the step S1 provided on the holder base 41s of the barrel cover 41u and the step S2 provided on the thin portion 35t of the holder 31. This groove TR is a part of the adhesive application part AA, and holds the adhesive AM1 supplied between the holder 31 and the barrel 41 around the thin part 35t of the base plate 31b to prevent unintentional diffusion. have a role to play. In other words, the steps S1 and S2 can be said to be diffusion prevention walls. When positioning the holder 31, which will be described later, the holder 31 is slightly displaced. With such displacement of the holder 31, the application state of the adhesive material AM1 becomes coarse or dense, and in the dense position, the adhesive material AM1 protrudes around the holder 31 (that is, the upper surface 31u), or the adhesive material AM1 is applied to the holder. There is a risk that it may protrude outside the pedestal 41s, which may impede subsequent adjustment or handling. In order to prevent this, a groove TR is provided to keep the adhesive AM1 in the required area. Note that the viscosity of the adhesive AM1 was specifically set to 5,000 to 50,000 mPa·s. Further, the thickness of the base plate 31b is approximately 1 mm, and the thickness of the thin portion 35t is approximately 0.5 mm. The amount of movement during positioning of the base plate 31b is approximately 0.5 mm, and does not exceed 1 mm.

The size of the base plate 31b of the holder 31 in a plan view, that is, the size projected on the XZ plane is smaller than the size of the holder base 41s in a plan view, and the opening 52o formed in the first metal frame 52a shown in FIG. Or it is smaller than the size of the receiving port OR in plan view. Thereby, even when the first metal frame 52a is fixed to the barrel 41, the holder 31 can be placed on the upper part 41q of the barrel 41 through the opening 52o or the receiving port OR of the first metal frame 52a.

Referring to FIG. 13, two protrusions 49s protruding forward from the side surface of the step S1 toward the +Z side are provided on the −Z side edge portion of the holder base 41s formed on the barrel cover 41u. The two protrusions 49s abut on two corresponding locations 39s on the thin wall portion 35t formed on the −Z side edge portion of the base plate 31b of the holder 31. The initial contact point 39d, which is the corresponding point 39s at the rear end of the holder 31, comes into contact with the initial contact point 49d, which is the two protrusions 49s of the holder base 41s of the barrel cover 41u, so that the holder 31 is attached to the barrel cover 41u. The initial position is set to . In this case, the distance from the display surface 11d of the first display element 11a to the first lens 21o of the first optical member 2a shown in FIG. 12 is slightly shorter than the proper distance. That is, during adjustment after the initial stage, the holder 31 can be moved in the +Z direction with respect to the barrel 41, and precise positioning in the Z direction can be achieved by finely adjusting the amount of movement of the holder 31 in the +Z direction.

The protrusions 49s for initial positioning are not limited to those provided on the -Z side edge of the holder base 41s, but as shown in area FR2 in FIG. The protrusion 149s can be provided on either of the edges of the holder base 41s on the ±X sides.

In order to be able to slightly move the position of the base plate 31b of the holder 31 in the X direction and the Z direction within the insertion opening 41z, the outline of the insertion opening 41z in plan view is compared to the outline of the base plate 31b and the first display element 11a in plan view. It is slightly larger than the outline. That is, the insertion opening 41z has a size that includes an adjustment allowance that allows the support frame 31a to be moved in the normal direction of the display surface 11d of the first display element 11a and in the lateral direction perpendicular thereto. In line with this, the space ISa that accommodates the first display element 11a and the support frame 31a is designed to avoid interference with the first display element 11a, etc., and allow minute movement of the first display element 11a, etc. There is. As a result, the insertion port 41z is partially opened and a gap G1 is formed at the front upper part of the holder 31, that is, at the front +Z side of the joint between the base plate 31b and the support frame 31a. That is, the insertion opening 41z has a gap G1 between it and the holder 31 on the back side or +Z side of the first display element 11a. The FPC portion 11f and the heat dissipation sheet 11s, which are wiring lines extending from the first display element 11a, extend to the outside of the barrel 41 through the gap G1. Before positioning and fixing the holder 31 to the barrel 41, a space between the front end of the insertion port 41z and the silicon substrate SS or the heat dissipation sheet 11 of the first display element 11a is inserted so as to cover the gap G1. An adhesive AM2, which is a sealing portion, is applied so as to fill the area, and after positioning a holder 31, which will be described later, the adhesive AM2 is cured. The adhesive AM2 has a relatively high viscosity before curing, making it easy to maintain its shape. When the adhesive material AM1 corresponding to the groove TR and the adhesive material AM2 corresponding to the gap G1 are combined, they form a closed shape like the four sides of a rectangle. The combination of both adhesives AM1 and AM2 is called a dustproof structure DP. The dustproof structure DP achieves fixation of the holder 31 and barrel 41 while ensuring dustproofing between the holder 31 and the barrel 41. The adhesives AM1 and AM2 of the dustproof structure DP extend along the periphery of the base plate 31b and protrude into the holder base 41s. The dustproof structure DP is a sealing member that is made of photocurable resin and maintains the position of the holder 31 with respect to the barrel 41. It is desirable that the adhesives AM1 and AM2 are materials that exhibit little curing shrinkage. The locations (groove TR and gap G1) to which the adhesives AM1 and AM2 constituting the dustproof structure DP are applied serve as the adhesive application portion AA. Note that in the case where a gap 31i is formed around the outlet of the FPC section 11f in the holder 31, the adhesive AM3 can also be applied and filled around the gap 31i for the purpose of ensuring dustproofing and waterproofing.

At the stage where the holder 31 is fixed to the barrel 41, the FPC part 11f and the heat dissipation sheet 11s are moved from the front upper part of the barrel 41 to the opening 52o of the first metal frame 52a shown in FIG. 4 or the +Z side front end of the receiving port OR. drawn out into the realm. In other words, the base side of the FPC section 11f and the heat dissipation sheet 11s, which is close to the barrel 41, is arranged near the front end region of the opening 52o, the FPC section 11f passes through the opening 52o, and the heat dissipation sheet 11s is disposed in the vicinity of the front end region of the opening 52o. 52a.

Note that, as shown in region FR2 in FIG. 13, a seal RK can be attached in advance to the upper surface of the barrel 41 so as to seal the insertion port 41z. By peeling off the seal RK immediately before inserting the base plate 31b of the holder 31 into the insertion port 41z, it is possible to ensure that dirt and dust are prevented from entering the barrel 41.

With reference to FIG. 14, fixing of the first combiner 103a to the barrel 41, that is, fixing of the see-through mirror 23 to the first projection optical system 12a will be described. In FIG. 14, region GR1 is a front view of the barrel 41 and the first combiner 103a, and region GR2 is a plan view of the barrel 41 and the first combiner 103a.

In the optical unit 300, a pair of projections 41f and 41g are formed on the front side of the barrel 41 so as to project laterally outward. Furthermore, a pair of attachment portions 62a and 62b are formed at the upper end 61g of the first combiner 103a so as to protrude inward, that is, on the −Z side. The pair of opposing inner surfaces 62s of the pair of mounting portions 62a and 62b fit with the pair of outward lateral surfaces 51s of the barrel 41 so as to sandwich them, so that positioning in the ±X direction reduces inclination. It will be done. The pair of rear side surfaces 62t of the pair of attachment parts 62a and 62b abut on the pair of step-shaped front side surfaces 51r of the barrel 41, and positioning in the ±Z direction is performed so as to reduce inclination. Further, the plurality of convex portions 59p protruding from the bottom surfaces 59j of the pair of protrusions 41f and 41g abut against the pair of upper surfaces 62j of the pair of attachment portions 62a and 62b, thereby performing positioning in the ±Y direction. After the above positioning, that is, after the 6-axis positioning, adhesive AM5 is supplied from the surroundings between the bottom surfaces 59j of the projections 41f and 41g and the top surfaces 62j of the mounting portions 62a and 62b, and the supplied adhesive AM5 is exposed to ultraviolet rays, etc. By curing the first combiner 103a, fixing of the first combiner 103a to the barrel 41 is completed.

The first combiner 103a is fixed to the barrel 41 before the holder 31 is fixed to the barrel 41. Conversely, when the holder 31 is fixed before the first combiner 103a is fixed, the holder 31 is positioned relative to the first projection optical system 12a.

FIG. 15 is a front sectional view of the first display driving section 102a of the first display device 100A shown in FIG. A first metal frame 52a is fixed to the barrel 41. The first metal frame 52a supports and determines the arrangement of the first display section 20a including the barrel 41. A lower cover 71a is arranged to cover the lower side of the barrel 41. The lower cover 71a is supported by the joint 50c and the first metal frame 52a shown in FIG. 4, and is connected to the support device 100C shown in FIG. 1 at the end on the left side of the drawing. An upper cover 71b is removably attached to the lower cover 71a.

A method of manufacturing the optical unit 300, and a method of assembling the display unit DU to the barrel 41, will be described with reference to FIGS. 16 to 18. In FIG. 17, region HR1 is a perspective view showing a state before the display unit DU is assembled to the barrel 41, and region HR2 is a perspective view showing a state while the display unit DU is being assembled.

In the case of this embodiment, as a premise for assembling the display unit DU to the barrel 41, the size of the opening 52o or the receiving opening O formed in the first metal frame 52a is set to The size is larger than that of the base plate 31b that constitutes the holder 31. That is, the first metal frame 52a has a receiving opening OR having a substantially rectangular outline C2 larger than the substantially rectangular outline C1 of the holder 31 when viewed from the insertion direction of the first display element 11a. Specifically, the width W21 of the receiving port OR is set to a larger value than the width W11 of the base plate 31b by ensuring a predetermined margin of about 1 mm. Further, the longitudinal width W22 of the receiving port OR is set to a larger value than the longitudinal width W21 of the base plate 31b, ensuring a predetermined margin of about 1 mm.

As shown in region HR1 of FIG. 17, first, a barrel 41 containing optical members 2a and 2b is prepared (step S10). The first lens 21o, second lens 21p, third lens 21q, and prism mirror 22 are positioned and fixed to the barrel body 41a by adhesive. Thereafter, the barrel cover 41u is airtightly fixed to the barrel body 41a by adhesive. At this stage, the barrel 41 is in a sealed state except for the insertion port 41z. A first combiner 103a is positioned and fixed to the front part of the barrel 41. Next, the first metal frame 52a is fixed to the barrel 41 (step S11). The first metal frame 52a is fixed to the upper part 41q of the barrel 41 using a fastening portion 51f.

Next, as shown in region HR2 of FIG. 17, the display unit DU is inserted into the barrel 41 (step S12). That is, the holder 31 is inserted into the insertion opening 41z of the barrel 41. Specifically, the support frame 31a of the holder 31 constituting the display unit DU is inserted into the insertion opening 41z together with the first display element 11a. Thereby, the first display element 11a can be placed inside the barrel 41. At this time, the base plate 31b of the holder 31 is placed on the holder base 41s of the barrel cover 41u. As a result, the insertion port 41z is substantially closed at the initial stage of attaching the holder 31 to the barrel 41, making it easier to ensure dustproofing inside the barrel 41. In this state, when the holder 31 is pressed backward in the -Z direction, the seat surface 41n, which is the surface of the holder base 41s provided on the barrel 41, is brought into contact with the lower surface 31j of the base plate 31b provided on the holder 31. Then, the two protrusions 49s provided on the barrel 41 come into contact with the two corresponding locations 39s provided on the holder 31 (see FIG. 13, etc.). Thereby, initial positioning is achieved (step S13). In this case, the holder 31 can be roughly positioned at the initial stage of attaching the holder 31 to the barrel 41. After the initial positioning, the adhesive AM1 is supplied to the steps S1 provided on the three edges of the holder base 41s, and the adhesive AM2 is supplied as a sealing part so as to close the gap G1 remaining in the insertion opening 41z of the barrel cover 41u. (Step S14).

Thereafter, as shown in FIG. 18, the upper surface 31u of the base plate 31b of the holder 31 is held by the arm RA of the three-dimensional driving device to support the holder 31. While adjusting the posture of the holder 31 in 6 axes using the arm RA, observe the imaging state, and stop moving the holder 31 or the display unit DU when the aberration is reduced to the extent that the desired optical performance can be achieved. (Step S15). That is, the holder 31 or the support frame 31a is positioned with respect to the first projection optical system 12a. Note that the arm RA supports the upper surface 31u of the holder 31, and can move the holder 31 in the directions of three axes α, β, and γ, and can rotate the holder 31 around the three axes α, β, and γ. Thereafter, the adhesives AM1 and AM2 supplied to the step S1 and the like are irradiated with ultraviolet light to harden the adhesives AM1 and AM2 (step S16). That is, the base plate 31b is fixed to the holder pedestal 41s provided near the insertion opening 41z of the barrel 41 using adhesives AM1 and AM2. In the above, the step of supplying the adhesive material AM1 to the step S1 of the holder base 41s and the step of supplying the adhesive material AM2 adjacent to the insertion opening 41z may be performed before the step of inserting the display unit DU into the barrel 41.

When the fixation of the holder 31 to the barrel 41 is completed, the first circuit member 80a is fixed in the recess RE on the first metal frame 52a (see FIG. 4). In this case, since the first circuit member 80a is fixed to the first metal frame 52a, it is possible to suppress the occurrence of a phenomenon in which extra force is applied to the barrel 41 or the holder 31 and the accuracy subsequently deteriorates.

Although the method for manufacturing the optical unit 300 for the first display device 100A has been described above, the optical unit 300 for the second display device 100B is also manufactured in the same manner. The optical unit 300 of the first display device 100A and the optical unit 300 of the second display device 100B are temporarily assembled by connecting the first metal frame 52a and the second metal frame 52b to the joint 50c. Here, the second metal frame 52b is the other support. By performing positioning while observing the relative image formation state of the pair of optical units 300 and completely fixing the metal frames 52a, 52b and the joint 50c, the first display device 100A and the second display device 100B can be Relative fixation is completed.

In the step of adjusting the attitude of the holder 31, the inside of the barrel 41 is sealed with the adhesives AM1 and AM2, and the first display element 11a can be assembled into the optical unit 300 with consideration given to dustproofing.

In the above description, the direction in which the holder 31 is moved by the arm RA is mainly the γ direction parallel to the optical axis AX. Therefore, the base plate 31b mainly moves in the direction along its lower surface 31j (specifically, in the ±Z direction), which makes it easy to secure space for positioning and to move the barrel 41 and optical unit 300. It becomes easy to downsize.

By determining the initial position of the holder 31, it is possible to reduce the burden of adjusting the posture along six axes. Furthermore, by performing initial positioning, it is possible to omit adjustment of movement and rotation of axes that have a low degree of influence. In other words, it is possible to perform simple posture adjustment by reducing the number of adjustment axes from the six-axis posture adjustment. Specifically, by initial positioning using the two protrusions 49s provided on the barrel 41, adjustment of rotation around the β-axis or the Y-axis can be omitted.

The HMD 200 of the first embodiment described above includes a first display element 11a, a holder 31 that holds the first display element 11a, and a first projection optical system 12a that projects an image formed on the first display element 11a. a case CA that houses the first projection optical system 12a in a positioned state and has an insertion opening 41z into which the first display element 11a supported by the holder 31 is inserted; and a first metal frame 52a that supports the case CA. The first metal frame 52a has a receiving opening OR that is larger than the outline of the holder 31 when viewed from the insertion direction of the first display element 11a.

In the HMD 200, the first metal frame 52a has a receiving opening OR that is larger than the outline of the holder 31 seen from the insertion direction of the first display element 11a, so the first metal frame 52a is fixed to the case CA in advance, and then supported. The frame 31a can be inserted into the insertion opening 41z, and the first display element 11a can be positioned and fixed with respect to the first projection optical system 12a. As a result, the first metal frame 52a can be positioned relative to other members, or the exterior member can be attached to the first metal frame 52a, reducing the situation where the case CA is subjected to external force during the assembly process, and 1 projection optical system 12a can be prevented from being subjected to external effects after positioning.

[Second embodiment]
The HMD of the first embodiment will be described below. Note that the HMD of the second embodiment is a partially modified version of the HMD of the first embodiment, and a description of the parts common to the HMD of the first embodiment will be omitted.

As shown in FIG. 19, the holder 231 has a T-shaped outer shape when viewed from the side. The holder 231 includes a support frame 31a that supports the first display element 11a, and a base plate 131b that is connected to the top of the support frame 31a and extends in a direction perpendicular to the support frame 31a. The base plate 131b has a first member 131ba extending forward, which is the light exit side or -Z side of the first display element 11a, and a rear part, which is the opposite side or +Z side with respect to the light exit side of the first display element 11a. It has an extending second member 131bb. The first member 131ba has a similar shape to the base plate 31b of the holder 31 of the first embodiment and functions similarly. On the other hand, the second member 131bb is supported by the +Z side end of the holder base 41s. Therefore, when assembling the display unit DU or the holder 231 to the barrel 41, it becomes easier to prevent the support frame 31a or the first display element 11a from tilting with respect to the optical axis AX. Further, the second member 131bb closes the gap G1 remaining on the +Z side of the insertion port 41z. In other words, the base plate 131b has a shape that covers the insertion opening 41z. Thereby, the insertion port 41z can be completely closed at the stage when the holder 231 is inserted into the barrel 41, and the dustproof effect is enhanced.

The FPC portion 11f and the heat dissipation sheet 11s are passed through a hole 31h formed in the second member 131bb and extend to the outside of the barrel 41. An adhesive can be applied and filled around the hole 31h for the purpose of ensuring dustproofing and waterproofing.

Regarding the T-shaped holder 231, in plan view, the base plate 131b extends outside the insertion opening 41z, and the area of the base plate 131b is larger than the area of the insertion opening 41z.

When using the T-shaped holder 231, the adhesive AM is supplied to the four edges surrounding the entire circumference of the rectangular base plate 131b.

In the HMD 200 of the first embodiment described above, the base plate 131b extends to the front corresponding to the light exit side of the first display element 11a and to the opposite rear. In this case, the base plate 131b and the side surface of the barrel 41 extend substantially in parallel, making it possible to increase the area of the base plate 131b while preventing the base plate 131b from becoming bulky after assembly. Furthermore, the base plate 131b (that is, the second member 131bb) extending rearward of the first display element 11a completely blocks the insertion opening 41z, so that the dustproof effect can be enhanced.

[Third embodiment]
The HMD of the first embodiment will be described below. Note that the HMD of the third embodiment is a partially modified version of the HMD of the first embodiment, and a description of the parts common to the HMD of the first embodiment will be omitted.

As shown in FIG. 20, in the case of the third embodiment, three openings 352g, 352p, and 352q are provided in the first metal frame 52a. These openings 352g, 352p, and 352q are provided in place of the opening 52o of the first metal frame 52a shown in FIG. 6. The opening 352g or the composite opening OR1 includes a rectangular gripping opening OR01 that exposes the base plate 31b that constitutes the holder 31 of the display unit DU shown in FIG. It has an extending adhesive opening OR02 and an adhesive opening OR3 provided at the tip of the adhesive opening OR02. The openings 352p and 352q function as adhesive openings OR2. The combination of the pair of adhesive openings OR2 and the pair of adhesive openings OR3 emits curing light for curing the adhesive material connecting the holder 31 and the barrel 41 (i.e., the case CA) to the four corners of the base plate 31b. used for supplying The adhesive opening OR02 is used to supply curing light for curing the adhesive supplied to the gap formed between the front end of the base plate 31b of the holder 31 and the insertion opening 41z of the barrel 41.

The gripping opening OR01 is provided for suctioning and supporting the upper surface 31u of the base plate 31b of the holder 31 with the arm of the three-dimensional drive device. When positioning, the base plate 31b is placed below the first metal frame 52a, that is, on the -Y side. The size of the grip opening OR01 or the opening 352g formed in the first metal frame 52a is smaller than the size of the base plate 31b of the holder 31. That is, the gripping opening OR01 or the opening 352g provided in the first metal frame 52a has a smaller outline than the outline of the holder 31 when viewed from the insertion direction of the first display element 11a.

The adhesive opening OR2 and the adhesive opening OR3 not only enable supply of curing light but also supply of adhesive material. The adhesive opening OR02 also makes it possible not only to supply the curing light, but also to supply the adhesive.

A method of manufacturing the optical unit 300 and assembling the display unit DU to the barrel 41 will be described with reference to FIGS. 21 and 22. In FIG. 22, region IR1 is a perspective view showing the state before the display unit DU is assembled to the barrel 41, region IR2 shows the state where the display unit DU is inserted into the barrel 41, and region IR3 is a perspective view showing the state before the display unit DU is assembled to the barrel 41. shows the state in which the first metal frame 52a is attached, and region IR4 shows the stage of positioning and fixing the holder 31 to the barrel 41.

First, as shown in area IR1 in FIG. 22, a barrel 41 containing an optical member is prepared (step S10). At this stage, the barrel 41 is in a sealed state except for the insertion port 41z. A first combiner 103a is fixed to the front portion of the barrel 41 in a positioned manner.

Next, as shown in area IR2 of FIG. 22, the display unit DU is inserted into the barrel 41 (step S301). That is, the support frame 31a of the holder 31 is inserted into the insertion opening 41z of the barrel 41 (see FIG. 12). At this time, the base plate 31b of the holder 31 is placed on the holder base 41s of the barrel cover 41u. As a result, the insertion port 41z is substantially closed at the initial stage of attaching the holder 31 to the barrel 41, making it easier to ensure dustproofing inside the barrel 41.

Next, as shown in region IR3 of FIG. 22, the first metal frame 52a is fixed to the barrel 41 (step S302). The first metal frame 52a is fixed to the upper part 41q of the barrel 41 using a fastening portion 51f. At this time, the base plate 31b of the holder 31 is sandwiched between the holder base 41z of the barrel 41 and the flat plate portion 55a of the first metal frame 52a. The center portion CP of the base plate 31b is exposed to the grip opening OR01 of the first metal frame 52a.

Next, when the holder 31 is pushed backward in the −Z direction, initial positioning is achieved (step S13). During initial positioning, the two protrusions 49s provided on the barrel 41 are brought into contact with the two corresponding locations 39s provided on the holder 31 using the method of the first embodiment shown in FIG. 13 etc. .

Next, using the adhesive applicator DD, fixing adhesive AM1 is supplied to the four corners of the base plate 31b of the holder 31 through the adhesive openings OR2 and OR3 of the first metal frame 52a, and the adhesive AM1 is supplied to the four corners of the base plate 31b of the holder 31 through the adhesive opening OR02. An adhesive AM2 is supplied as a sealing member so as to close the gap G1 remaining in the insertion opening 41z of the cover 41u (step S14).

Thereafter, as shown in area IR4 in FIG. 22, the central portion CP of the base plate 31b of the holder 31 is sucked by the arm RA of the three-dimensional drive device to support the holder 31. The posture of the holder 31 is adjusted in six axes by the arm RA, and the movement of the holder 31 or the display unit DU is stopped in a state where the aberration is reduced to the extent that the desired optical performance can be achieved (step S15). Thereafter, the adhesives AM1, AM2 are irradiated with ultraviolet light EB through the adhesive openings OR2, OR3, OR02 to harden the adhesives AM1, AM2 (step S16). That is, the base plate 31b is fixed to the holder base 41s provided near the insertion opening 41z of the barrel 41 using adhesives AM1 and AM2, and the insertion opening 41z is sealed.

In the above, the step of supplying the adhesive material AM1 to the step S1 of the holder base 41s and the step of supplying the adhesive material AM2 adjacent to the insertion opening 41z is performed before the step of inserting the display unit DU into the barrel 41, or before the step of inserting the display unit DU into the barrel 41. This can be done after the step of fixing the first metal frame 52a.

There is no need to distinguish between the adhesives AM1 and AM2, and the common adhesive AM1 can be supplied to the adhesive openings OR3 and OR02. Furthermore, it is not necessary to supply the adhesive AM2 to the adhesive opening OR02, and if a holder 231 as shown in FIG. 19 is used, the sealing effect can be enhanced.

The number and arrangement of the adhesive openings OR2 and OR3 are not limited to those shown in the drawings, and can be changed as appropriate while taking into consideration the required strength and accuracy. Furthermore, the sizes of the adhesive openings OR2 and OR3 are not limited to those shown in the drawings, and can be changed as appropriate.

The HMD 200 of the second embodiment described above includes a first display element 11a, a holder 231 that holds the first display element 11a, and a first projection optical system 12a that projects an image formed on the first display element 11a. , a case CA that stores the first projection optical system 12a in a positioned state, and a first metal frame 52a that supports the case CA.The holder 231 is installed in the case CA while supporting the first display element 11a. The first metal frame 52a includes a support frame 31a that is inserted into the case CA through a formed insertion opening 41z, and a base plate 31b connected to the upper part of the support frame 31a. 31b, and adhesive openings OR2 and OR3 that supply curing light to harden the adhesives AM1 and AM2 that connect the holder 231 and the case CA.

In the above HMD 200, the first metal frame 52a has a gripping opening OR01 that exposes the base plate 31b of the holder 231, and adhesive openings OR2 and OR3 that supply curing light to harden the adhesive that connects the holder 231 and the case CA. Therefore, it is assumed that the support frame 31a is inserted into the insertion port 41z in advance and the first metal frame 52a is fixed to the case CA so as to cover the base plate 31b. Thereafter, while supporting the base plate 31b through the grip opening OR01, the first display element 11a supported by the support frame 31a is positioned with respect to the first projection optical system 12a, and the first display element 11a is positioned between the holder 231 and the case CA. By irradiating the supplied adhesive with curing light through the adhesive insertion port, the holder 231 and the case CA can be connected. In this case, since the base plate 31b is fixed to the case CA while covering the insertion opening 41z, the base plate 31b can have the role of blocking the insertion opening 41z at the initial stage of attaching the holder to the case CA. The time during which the first projection optical system 12a and the first display element 11a supported by the support frame 31a are exposed to the external environment can be relatively shortened, and dustproofing can be easily ensured. In addition, since the first display element 11a is housed in the case CA in the initial stage of installation, it is possible that the first display element 11a may be displaced due to an external load after adjusting the arrangement of the first display element 11a. The phenomenon will no longer occur.

[Other variations]
Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the gist thereof. Modifications such as the following are also possible.

In the above description, the HMD 200 includes the first display device 100A and the second display device 100B. It may be something that is supported in front of the eyes.

In the above description, it is assumed that the support frame 31a and the base plate 31b extend in a direction perpendicular to each other, but the support frame 31a and the base plate 31b are not limited to be perpendicular to each other, and may be bent and extend in a direction that intersects with each other. .

Although the size of the base plate 31b is approximately the same as that of the support frame 31a, it may be approximately half the size or less of the support frame 31a.

The shape of the base plate 31b is not limited to a rectangle, but can be various shapes such as a circle, an ellipse, and a polygon.

The steps S1 and S2 can be replaced with other structures capable of restricting the movement of the adhesives AM1 and AM2, and can be replaced with protrusions, for example.

The optical members 2a and 2b of the first projection optical system 12a are not limited to those shown in the figure, and the number of optical elements and the shape of the optical surface constituting the first optical member 2a may be changed as appropriate depending on the purpose of use of the HMD 200, etc. Can be changed.

Although the above description assumes that the HMD 200 is used while being worn on the head, the image display device 100 can also be used as a handheld display that is viewed like binoculars without being worn on the head. That is, in the present invention, the head-mounted display also includes a handheld display.

A first type of image display device in a specific embodiment includes a display element, a holder that holds the display element, a projection optical system that projects an image formed on the display element, and a positioning state of the projection optical system that is stored. and a case having an insertion opening into which a display element supported by the holder is inserted, and a metal frame supporting the case, the metal frame having a reception opening that is larger than the outline of the holder when viewed from the insertion direction of the display element. have

In the image display device described above, the metal frame has a receiving opening that is larger than the outline of the holder when viewed from the insertion direction of the display element, so the metal frame is fixed to the case in advance, and then the support frame is inserted into the insertion opening and the display element is inserted. It can be positioned and fixed relative to the projection optical system. This allows the metal frame to be positioned relative to other members or the exterior member to be attached to the metal frame, reducing the situation where the case is subjected to external forces during the assembly process, and allowing the projection optical system to be exposed to external forces after positioning. can be prevented from being affected.

In a specific embodiment of the image display device, the holder includes a support frame that is inserted into the case through the insertion port while supporting the display element, and a base plate that is connected to the top of the support frame. In this case, since the base plate is fixed to the case while covering the insertion slot, the base plate can have the role of blocking the insertion slot at the initial stage of attaching the holder to the case, and the projection optical system and support inside the case can be The time that the display element supported by the frame is exposed to the external environment can be shortened, and dustproofing can be easily ensured. Further, since the display element is housed in the case at the initial stage of installation, the phenomenon that the display element is displaced due to an external load after adjusting the arrangement of the display element does not occur.

In a specific embodiment of the image display device, the insertion opening of the case has a gap between it and the holder on the back side of the display element, and the wiring extending from the display element extends outside through the gap. In this case, the wiring extending from the display element can be guided above the metal frame through the receiving hole and connected to the circuit member.

In a specific embodiment of the image display device, a heat dissipation member is bonded to the back surface of the display element, and the heat dissipation member extends to the outside through a gap.

In a specific embodiment of the image display device, the metal frame is formed of an alloy containing one or more of magnesium, manganese, aluminum, and titanium. In this case, it is possible to reduce the weight while increasing the rigidity of the metal frame.

In a specific embodiment of the image display device, the metal frame is coated with a black surface coating. In this case, the heat dissipation effect due to radiation from the surface can be enhanced.

In a specific embodiment of the image display device, the metal frame includes a flat plate portion having an insertion opening and a pair of reinforcing projections protruding from the flat plate portion. In this case, the structural strength of the metal frame increases, making it easier to stably support the display section.

In a specific embodiment of the image display device, the case includes a container-shaped main body having a bottom plate member and a side wall, and a cover that is provided with an insertion port and forms a storage space by covering the inside of the main body, and the case includes a projection optical system. The system includes a first optical member arranged on the light exit side of the display element, and a second optical member arranged on the light exit side of the first optical member and bends the optical path by a reflective surface. In this case, it becomes easy to arrange and position the optical elements constituting the projection optical system in the container-shaped case, and the cover makes it easy to ensure dustproofing. Furthermore, the optical path is bent by the second optical member, making it easier to downsize the projection optical system.

In a specific embodiment of the image display device, the case has a step around the holder pedestal that is joined to the base plate to hold the adhesive that has protruded due to the positioning of the holder and prevent it from spreading. In this case, it becomes easy to hold the adhesive on the holder base.

In a specific embodiment of the image display device, a first surface formed on the base plate and a second surface formed on the holder pedestal face each other, and a plane extending from the first surface intersects the second optical member. do. In this case, the holder base is formed at a position recessed toward the center of the case, and the amount of protrusion of the base plate of the holder can be suppressed.

A second type of image display device according to one aspect of the present invention includes a display element, a holder that holds the display element, a projection optical system that projects an image formed on the display element, and a state in which the projection optical system is positioned. The holder includes a case for storing the display element, and a metal frame for supporting the case. The metal frame has a gripping aperture that exposes the base plate of the holder and an adhesive aperture that provides curing light to cure the adhesive connecting the holder and the case.

In the image display device described above, the metal frame has a gripping opening that exposes the base plate of the holder and an adhesive opening that supplies curing light that hardens the adhesive that connects the holder and the case. It is assumed that the metal frame is inserted into the case and fixed to the case so that it covers the base plate. After that, while supporting the base plate through the gripping opening, position the display element supported by the support frame with respect to the projection optical system, and insert the adhesive supplied between the holder and the case through the adhesive insertion opening. The holder and the case can be connected by irradiating the holder with curing light. In this case, since the base plate is fixed to the case while covering the insertion slot, the base plate can have the role of blocking the insertion slot at the initial stage of attaching the holder to the case, and the projection optical system and support inside the case can be The time during which the display element supported by the frame is exposed to the external environment can be relatively shortened, and dustproofing can be easily ensured. Further, since the display element is housed in the case at the initial stage of installation, the phenomenon that the display element is displaced due to an external load after adjusting the arrangement of the display element does not occur.

The image display device in a specific embodiment includes a first display device having a structure corresponding to the above-described image display device, a second display device having a structure corresponding to the above-described image display device, and a second display device provided in the first display device. The display device includes a joint that connects a first metal frame corresponding to the metal frame provided on the second display device and a second metal frame corresponding to the metal frame provided on the second display device. In this case, the first metal frame and the second metal frame can be positioned via the joint, and the first display device and the second display device can be adjusted in position after each display device is assembled.

A first type optical unit according to one aspect of the present invention includes a display element, a holder that holds the display element, a projection optical system that projects an image formed on the display element, and a positioning state in which the projection optical system is stored. and a case having an insertion opening into which a display element supported by the holder is inserted, and a metal frame supporting the case, the metal frame having a reception opening that is larger than the outline of the holder when viewed from the insertion direction of the display element. have

A second type optical unit according to one aspect of the present invention includes a display element, a holder that holds the display element, a projection optical system that projects an image formed on the display element, and a positioning state in which the projection optical system is stored. and a metal frame that supports the case, and the holder is connected to the support frame that is inserted into the case through an insertion opening formed in the case while supporting the display element, and the upper part of the support frame. The metal frame has a gripping aperture that exposes the base plate of the holder and an adhesive aperture that provides curing light to cure the adhesive connecting the holder and the case.

A method for manufacturing an optical unit according to one aspect of the present invention includes fixing a holder for holding a display element to a case in which the projection optical system is housed in a positioned state, and arranging the display element in the case. The holder includes a support frame that is inserted into the case through an insertion opening formed in the case while supporting the display element, and a base body connected to the base side of the support frame, The support frame is inserted into the insertion opening formed in the case, the support frame is positioned relative to the projection optical system by supporting the base plate, and the support frame is supplied between the holder and the case in order to connect the holder and the case. The cured adhesive is irradiated with curing light.

In the above manufacturing method, the support frame is inserted into the insertion opening formed in the case, the support frame is positioned with respect to the projection optical system by supporting the base plate, and the holder and the case are connected. Since it is fixed to the case while covering the insertion slot, the base plate can have the role of blocking the insertion slot at the initial stage of attaching the holder to the case, and the display supported by the projection optical system and support frame inside the case can be used to cover the insertion slot. The time the element is exposed to the external environment can be relatively shortened, and dustproofing can be easily ensured.

In the method for manufacturing an optical unit in a specific embodiment, a metal frame having a receiving opening larger than the contour of the holder as seen from the insertion direction of the display element is fixed to the case, and the support frame is attached to the insertion opening by supporting the base plate. The display element is positioned with respect to the projection optical system, and the adhesive material supplied between the holder and the case is irradiated with curing light to connect the holder and the case. In this case, the metal frame can be positioned relative to other members, or the exterior member can be attached to the metal frame, reducing the situation where the case is subjected to external forces during the assembly process, and the projection optical system is can be prevented from being affected.

In the method for manufacturing an optical unit in a specific embodiment, the support frame is inserted into the insertion port by supporting the base plate, and the gripping insertion port exposes the base plate of the holder, and the adhesive material connects the holder and the case. A metal frame having an adhesive opening that supplies curing light for curing is fixed to the case in a state covering the base plate, and by supporting the base plate through the gripping opening, the support frame inserted into the insertion slot is The supported display element is positioned with respect to the projection optical system, and the adhesive supplied between the holder and the case is irradiated with curing light through the adhesive insertion port to connect the holder and the case. In this case, the metal frame can be positioned relative to other members, or the exterior member can be attached to the metal frame, reducing the situation where the case is subjected to external forces during the assembly process, and the projection optical system is can be prevented from being affected.

In the method for manufacturing an optical unit in a specific embodiment, the optical unit is one of a pair of optical systems, and after the holder and the case are connected, the metal frame is connected between the support of the other of the pair of optical systems. Connect to the intervening joint.

2a...first optical member, 2b...second optical member, 11a...first display element, 11b...second display element, 11f...FPC section, 11s...heat dissipation sheet, 12a...first projection optical system, 12b...second Projection optical system, 20a...First display section, 20b...Second display section, 21, 22, 23...Optical element, 22...Prism mirror, 22b...Reflection surface, 22c...Emission surface, 23...See-through mirror, 23a...Transmission reflective film, 23c... reflective surface, 31... holder, 31a... support frame, 31b... base plate, 31j... lower surface, 31u... upper surface, 33... light shielding plate, 41... barrel, 41a... barrel body, 41n... seat surface, 41o... Injection port, 41s... Holder pedestal, 41u... Barrel cover, 41x... Top plate, 41z... Insertion port, 44... Edge, 49d... Initial contact point, 49p... Initial contact surface, 50... Support device, 50c ...Joint, 52a...First metal frame, 52b...Second metal frame, 52o...Opening, 55a...Flat plate part, 55b, 55c...Reinforcement protrusion, 61...Support plate, 61g...Upper end, 62a, 62b...Mounting part, 71 ...Cover, 80a...Circuit member, 88...Display control device, 100...Image display device, 100A...First display device, 100B...Second display device, 100C...Support device, 102a, 102b...Display drive unit, 103a...First display device 1 combiner, 103b...second combiner, 300...optical unit, AM, AM1, AM2...adhesive, AX...optical axis, CA...case, DD...adhesive coating device, DU...display unit, EB...ultraviolet light, EP ...exit pupil, IS...storage space, ML...image light, OL...external light, C1, C2...contour, OR...receptor, OR01...grasping aperture, OR1...compound aperture, OR2, OR3, OR02...gluing aperture, OS ...off-axis optical system, P1-P3...optical path section, PP...pupil position, RE...recess, RM...heat dissipation member, TR...groove

Claims (18)

A display element;
a holder that holds the display element;
a projection optical system that projects the image formed on the display element;
a case that houses the projection optical system in a positioned state and has an insertion opening into which the display element supported by the holder is inserted;
A metal frame that supports the case,
The metal frame has a receiving opening that is larger than the outline of the holder when viewed from the insertion direction of the display element. The holder includes a support frame inserted into the case through the insertion port while supporting the display element, and a base plate connected to an upper part of the support frame. Image display device. The insertion opening of the case has a gap between it and the holder on the back side of the display element,
The image display device according to claim 1 , wherein a wiring extending from the display element extends to the outside through the gap. The image display device according to claim 3, wherein a heat dissipation member is bonded to the back surface of the display element, and the heat dissipation member extends to the outside through the gap. The image display device according to claim 1, wherein the metal frame is formed of an alloy containing one or more of magnesium, manganese, aluminum, and titanium. The image display device according to claim 5, wherein the metal frame has a black surface coating. The image display device according to claim 1, wherein the metal frame includes a flat plate portion having the insertion opening and a pair of reinforcing projections protruding from the flat plate portion. The case includes a container-shaped main body having a bottom plate member and a side wall, and a cover provided with the insertion opening and forming a storage space by covering the inside of the main body,
The projection optical system includes a first optical member arranged on the light exit side of the display element, and a second optical member arranged on the light exit side of the first optical member and bends an optical path by a reflective surface. Item 1. The image display device according to item 1. 9. The image display device according to claim 8, further comprising a step around a holder pedestal joined to the base plate in the case, for holding the adhesive protruding due to the positioning of the holder and preventing it from spreading. A first surface formed on the base plate and a second surface formed on the holder pedestal face each other,
The image display device according to claim 9, wherein a plane extending from the first surface intersects the second optical member. A display element;
a holder that holds the display element;
a projection optical system that projects the image formed on the display element;
a case for storing the projection optical system in a positioned state;
A metal frame that supports the case,
The holder includes a support frame that is inserted into the case through an insertion opening formed in the case while supporting the display element, and a base plate connected to an upper part of the support frame,
The metal frame has a gripping opening that exposes the base plate of the holder, and an adhesive opening that supplies curing light to harden an adhesive connecting the holder and the case. A first display device having a structure corresponding to the image display device according to any one of claims 1 and 11;
a second display device having a structure corresponding to the image display device according to any one of claims 1 and 11;
An image including a joint that connects a first metal frame corresponding to the metal frame provided on the first display device and a second metal frame corresponding to the metal frame provided on the second display device. Display device. A display element;
a holder that holds the display element;
a projection optical system that projects the image formed on the display element;
a case that houses the projection optical system in a positioned state and has an insertion opening into which the display element supported by the holder is inserted;
A metal frame that supports the case,
The metal frame has a receiving opening that is larger than the outline of the holder when viewed from the insertion direction of the display element. A display element;
a holder that holds the display element;
a projection optical system that projects the image formed on the display element;
a case for storing the projection optical system in a positioned state;
A metal frame that supports the case,
The holder includes a support frame that is inserted into the case through an insertion opening formed in the case while supporting the display element, and a base plate connected to an upper part of the support frame,
The metal frame has a grip opening that exposes the base plate of the holder, and an adhesive opening that supplies curing light that cures an adhesive connecting the holder and the case. A method for manufacturing an optical unit, the method comprising: fixing a holder holding a display element to a case in which a projection optical system is housed in a positioned state; and arranging the display element in the case.
The holder includes a support frame that is inserted into the case through an insertion opening formed in the case while supporting the display element, and a base body connected to the base side of the support frame. ,
inserting the support frame into an insertion opening formed in the case;
positioning the support frame with respect to the projection optical system by supporting the base plate;
A method for manufacturing an optical unit, comprising irradiating an adhesive supplied between the holder and the case with curing light to connect the holder and the case. fixing to the case a metal frame having a receiving opening larger than the outline of the holder when viewed from the insertion direction of the display element;
inserting the support frame into the insertion opening and positioning the display element with respect to the projection optical system by supporting the base plate;
16. The method for manufacturing an optical unit according to claim 15, wherein the adhesive material supplied between the holder and the case is irradiated with curing light to connect the holder and the case. inserting the support frame into the insertion slot by supporting the base plate;
A metal frame having a grip insertion opening that exposes the base plate of the holder and an adhesive opening that supplies curing light that cures the adhesive connecting the holder and the case is attached to the metal frame while covering the base plate. fixed to the case,
positioning the display element supported by the support frame inserted into the insertion opening with respect to the projection optical system by supporting the base plate through the gripping opening;
The method for manufacturing an optical unit according to claim 15, wherein the adhesive material supplied between the holder and the case is irradiated with curing light through the adhesive insertion port to connect the holder and the case. . The optical unit is one of a pair of optical systems,
The optical system according to any one of claims 15 to 17, wherein after the holder and the case are connected, the metal frame is connected to a joint interposed between the other support of the pair of optical systems. How the unit is manufactured.

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